Rose had adopted a new life under an assumed name after the sinking. Her family wasn’t even aware that she had been on the Titanic, much less met what she considered her soulmate.
Rose allowed herself to tell the story that had weighed on her for 70 years, nearly her entire life, because she knew she was nearing the end of her life.
That’s why her scenes are so powerful.
I’m so confused because I thought Rose was an amalgamation but you’re speaking of a singular individual in a factual way that makes me wonder how wrong I am. Is there really a Rose from the titanic that aligns with what you’re saying?
Not sure how long it’s been since you saw the movie but it starts and ends with a much older Rose in the modern era, on board a research vessel out looking for the wreck of the Titanic. While aboard she starts telling the story of her time on the Titanic, that story then becomes the rest of the film. There’s a sort of epilogue at the end where she wraps it up, then passes away in bed.
I think that’s what OP is talking about.